Thanks, I am not sure if there is something that goes between the vent tube connected to the filler tube and the vent tube assembly. Is the vent tube assembly a functioning part that has some sort of valve in it? Like a one way or something?
Not sure if you are referring to the earlier 69 type vent or the newer "up front" which interconnects with the carbon can system
The old system has no valve. The cap is completely sealed, and the vent is simply an open 1/4" tube that goes down and ends, open end, inside the rear frame rail. The only possible way it could dribble is if the tank is EXTREMELY full, "up into" the filler tube, and either expands enough, or is parked on a side hill so that fuel is forced out. Even so, only a cup or two will drain, after it gets down below that level it can no longer do so.
If you are referring to the 70/ later evap system, "it changes." Your car should have a vapor separator can in the trunk. The 1/4 line up to front has a valve right near the engine end. If you look through those manuals, it's in there. Again, some is in the fuel system, and some is in the emissions section in the back of the book